The **VLP-450-R** is a specific electronic component typically categorized as a **Vertical LED Light Pipe**. These are used in electronics to transmit light from a surface-mount (SMT) LED on a Printed Circuit Board (PCB) to a front panel or display area. Below is a detailed breakdown of its electronic and mechanical specifications. --- ### 1. General Specifications The VLP series (Vertical Light Pipe) is manufactured by **Bivar Inc.** and is designed for high-efficiency light transmission. | Feature | Specification | | :--- | :--- | | **Model Number** | VLP-450-R | | **Material** | Polycarbonate (Clear) | | **Flammability Rating** | UL 94V-0 | | **Mounting Type** | Press-fit / Vertical | | **Light Pipe Diameter** | 3mm (Standard) | | **Height (Length)** | 0.450" (11.4mm) | --- ### 2. Key Component Parts The "Electronic Part" functionality of the VLP-450-R is passive. It acts as an optical bridge between the active light source and the user interface. * **The Pipe (Body):** Made of optical-grade clear polycarbonate. It uses the principle of **Total Internal Reflection (TIR)** to move photons from the PCB to the lens tip with minimal light loss. * **The Base:** Designed with a "counter-bore" or recessed area at the bottom. This allows it to sit directly over a 0603, 0805, or 1206 sized SMT LED without touching the delicate solder joints. * **The Lens (Top):** Usually available in different shapes (the "-R" typically denotes a **Round** or **Radiused** profile), which diffuses the light for a wide viewing angle. --- ### 3. Application Circuit Context While the light pipe itself does not have pins or voltage requirements, it is designed to work with specific electronic environments: * **LED Compatibility:** Best paired with high-intensity SMT LEDs. Because the pipe has a 0.450" rise, using a low-lumen LED may result in a dim output at the panel. * **PCB Footprint:** Requires a non-plated through-hole (NPTH) in the PCB if the mounting involves press-fit pins, or it sits flush on the surface depending on the specific sub-series mounting clips. --- ### 4. Technical Advantages 1. **ESD Protection:** Since the light pipe is made of plastic, it provides a physical barrier between the outside environment and the PCB, protecting sensitive SMT LEDs from **Electrostatic Discharge (ESD)**. 2. **Alignment:** The VLP-450-R ensures that light is perfectly centered in a panel hole, even if the PCB is mounted deep within an enclosure. 3. **Cross-talk Prevention:** It helps prevent light from one LED from bleeding into the adjacent status indicator.